On 2019-01-16 22:40, Erik Rijkers wrote:

If you add a generated column to a file_fdw foreign table, it works OK
wih VIRTUAL (the default) but with STORED it adds an empty column,
silently.  I would say it would make more sense to get an error.

VIRTUAL is gone, but that other issue is still there: STORED in a file_fdw foreign table still silently creates the column which then turns out to be useless on SELECT, with an error like:

"ERROR:  column some_column_name is a generated column
DETAIL:  Generated columns cannot be used in COPY."

Maybe it'd be possible to get an error earlier, i.e., while trying to create such a useless column?


thanks,

Erik Rijkers








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